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Finding the Fourth Proportional to 111.72, 168.57 and 107.50

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Solution

The fourth proportional to 111.72, 168.57 and 107.50 is: 162.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.72 : 168.57 = 107.50 : x
  2. Step 2: Convert to fraction form
    111.72/168.57 = 107.50/x
  3. Step 3: Cross multiply
    111.72x = 168.57 × 107.50
  4. Step 4: Simplify right side
    111.72x = 18,121.26
  5. Step 5: Solve for x
    x = 18,121.26/111.72
  6. Step 6: Final answer
    x = 162.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.